Light Align tool ( LightPaint feature as in HDRI Light Studio )
The Add-on Blender Light Studio - https://leomoon.com/downloads/plugins/blender-light-studio/ - offers that functionality via a modal operator. Activate the Add-on and add a light profile in the Toolbar on the left. After that, add a light via the interface too. Now, when a light is active, you can enable the interactive placement mode, called 3D Edit, like this:



Basically, you click on a face of the model, and the Add-on calculates the light position for you. Once you're happy, hit the Esc key to exit the interactive placement mode.